Admin site is not working and throwing Error about one of the views but views are still working django

This is the Error it is throwing Plz check

I am trying to get the posts related to certain tag and I did that but when I accessing admin panel it is showing on posts_tag view, I am not able to debug that why it is related to admin panel

    class Post(models.Model):
    title = models.CharField(max_length=100)
    content = models.TextField()
    date_posted = models.DateTimeField(default=timezone.now)
    author = models.ForeignKey(User,on_delete=models.CASCADE)
    tags = models.ManyToManyField('Tag',through='Tagged')
    class Meta:
        ordering=['-date_posted']
    def __str__(self):
        return self.title

    def get_absolute_url(self):
        return reverse('post-detail',kwargs={'pk':self.pk})
`class Tag(models.Model):
    name=models.CharField(max_length=50)
    posts = models.ManyToManyField('Post',through='Tagged')

    def __str__(self):
        return self.name
class Tagged(models.Model):
    post = models.ForeignKey(Post,on_delete=models.CASCADE)
    tag = models.ForeignKey(Tag,on_delete=models.CASCADE)

urls.py

urlpatterns=[
path('',views.post_list,name='blog-home'),
path('<tag>/',views.post_tag,name='blog-tag'),
path('post/<int:pk>/',views.post_detail,name='post-detail'),
path('post/new/',views.post_create,name='post-create'),
path('post/<int:pk>/update/',views.post_update,name='post-update'),
path('post/<int:pk>/delete/',views.post_delete,name='post-delete'),
path('about/',views.about,name='blog-about')]

views.py

def post_tag(request,tag):
    t=Tag.objects.get(name=tag).posts.all()
    tags = Tagged.objects.all()
    return render(request,'blog/home.html',context={'posts':posts,'tags':tags})`